Yes, that theory is almost always applied when a woman is a victim of violence, of coercive control. Almost systematically, the abuser claims that the problem is not that he is violent, but that she is alienating the children. Some 250 women's organizations as well as many women's centres have brought attention to that.
In the few seconds that are left, I could talk about Spain and answer your first question.
The Spanish government passed a law prohibiting the courts from using unscientific pseudo-concepts like parental alienation. The country has made it clear that doing so is unacceptable. Courts cannot make decisions based on that myth. That is what the UN Special Rapporteur on violence against women and girls recommended.
It's also what we are recommending the committee include in its report.